Re: [HACKERS] pg_stat_file() and length/size

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
Cc: PostgreSQL-patches <pgsql-patches(at)postgresql(dot)org>
Subject: Re: [HACKERS] pg_stat_file() and length/size
Date: 2005-08-15 23:04:35
Message-ID: 200508152304.j7FN4Z121068@candle.pha.pa.us
Views: Raw Message | Whole Thread | Download mbox | Resend email
Thread:
Lists: pgsql-hackers pgsql-patches

Bruce Momjian wrote:
> I am thinking the proper term for the first column of pg_stat_file() is
> "size", not "length".
>
> test=> select * from pg_stat_file('.');
> length | atime | mtime | ctime | isdir
> --------+------------------------+------------------------+------------------------+-------
>
> 512 | 2005-08-13 23:06:38-04 | 2005-08-13 23:06:54-04 | 2005-08-13 23:06:54-04 | t
> (1 row)

I have renamed the column from length to size. I also renamed the
timestamp columns to be more meaningful:

test=> select (pg_stat_file('.')).*;
size | access | modification | change | creation | isdir
------+------------------------+------------------------+------------------------+----------+-------
512 | 2005-08-15 18:10:10-04 | 2005-08-15 17:30:28-04 | 2005-08-15 17:30:28-04 | | t
(1 row)

(Anyone have a better name for "change"?)

In doing this I also realized the ctime on Unix is change time (file
contents or inode), while on Win32 ctime is file creation time. I split
the ctime column into "change" and "creation", and one is null on each
platform. Above is the Unix output. I have also updated the catalog
version.

--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001
+ If your life is a hard drive, | 13 Roberts Road
+ Christ can be your backup. | Newtown Square, Pennsylvania 19073

Attachment Content-Type Size
unknown_filename text/plain 6.3 KB

In response to

Browse pgsql-hackers by date

  From Date Subject
Next Message Bruce Momjian 2005-08-15 23:14:38 Re: Changes improve the performance of INSERT and UPDATE
Previous Message Michael Fuhr 2005-08-15 22:45:04 Re: Testing of MVCC

Browse pgsql-patches by date

  From Date Subject
Next Message Bruce Momjian 2005-08-16 01:55:15 Re: [PATCHES] enable/disable trigger (Re: Fwd: Open items)
Previous Message Matt Miller 2005-08-15 14:03:38 Re: PL/pgSQL: SELECT INTO EXACT